A series of blasts tore through warehouses storing hazardous substances in the north-eastern port city of Tianjin last Wednesday.

Concern grew following reports that tonnes of toxic sodium cyanide was stored on site.

Efforts are underway to calm contamination fears:

“Right now, apart from ammonia, which is above readings of one milligram, all other chemicals are within the standard readings even several hundred metres from the site of the blast.” said Shi Luze, the Chief of Staff of the Beijing Military Region

At least 112 people were killed in the explosions.

Hundreds of people are being treated in hospital.

Dozens of websites have been shut down for allegedly publishing unverified information about the threat of contamination.